81874578 has 8 divisors (see below), whose sum is σ = 163749168. Its totient is φ = 27291524.

The previous prime is 81874577. The next prime is 81874609. The reversal of 81874578 is 87547818.

It is a sphenic number, since it is the product of 3 distinct primes.

81874578 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (81874577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6822876 + ... + 6822887.

It is an arithmetic number, because the mean of its divisors is an integer number (20468646).

Almost surely, 2^81874578 is an apocalyptic number.

81874578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81874578 is a wasteful number, since it uses less digits than its factorization.

81874578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13645768.

The product of its digits is 501760, while the sum is 48.

The square root of 81874578 is about 9048.4572165646. The cubic root of 81874578 is about 434.2265341034.

The spelling of 81874578 in words is "eighty-one million, eight hundred seventy-four thousand, five hundred seventy-eight".